Lakeland areaKey additions: DH Gary Sheffield, RHP Jose Mesa, LHP Joey Eischen.Key losses: LHP Jamie Walker.Spring questions: Is Sheffield's wrist completely healed? And if it is, how much will he energize a lineup that could have used his right-handed sock last October? ... Does ex-Marlin Todd Jones hold onto the closer's job or is it time for flame-throwing Joel Zumaya to take over? ... Which lefty steps up to replace Walker, one of the most underrated relievers in the game?Phenom watch: Despite just 11 professional appearances, none as a starter, LHP Andrew Miller could push for a spot at the back of the rotation.